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Currently you are able to watch "Diabolical - Season 3" streaming on Discovery +, Discovery+ Amazon Channel or buy it as download on Apple TV.
There are no options to watch Diabolical for free online today in Canada. You can select 'Free' and hit the notification bell to be notified when season is available to watch for free on streaming services and TV.
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There is something so devious about the killers in Diabolical that we are momentarily held in their thrall. But what makes Diabolical truly unforgettable are the fascinating, terrifying masterminds behind these meticulous, premeditated murders.